Quran 18:104 — The Cave (Al-Kahf)

الَّذينَ ضَلَّ سَعيُهُم فِى الحَيوٰةِ الدُّنيا وَهُم يَحسَبونَ أَنَّهُم يُحسِنونَ صُنعًا

"They are the ones whose works in this life are totally astray, but they think that they are doing good."

[18:103] Say, "Shall I tell you who the worst losers are?

[18:105] Such are the ones who disbelieved in the revelations of their Lord and in meeting Him. Therefore, their works are in vain; on the Day of Resurrection, they have no weight.